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The Media Access Control (MAC) address is a globally
unique address typically stored in a network card. It is defined as "a
hardware address that uniquely identifies each node of a network. In IEEE 802
networks, the data link layer of the OSI Reference Model is divided into two
sublayers: the Logical Link Control (LLC) layer and the Media Access Control
(MAC) layer. The MAC layer interfaces directly with the network media.
Consequently, each different type of network media requires a different MAC
layer. On networks that do not conform to the IEEE 802 standards but do conform
to the OSI Reference Model, the node address is called the Data Link Control
(DLC) address." The IEEE serves as the registration authority for
reserving IEEE 802 MAC Addresses. Because they are globally unique numbers,
IEEE 802 MAC Addresses are often used for other purposes, and are referred to
as Organizationally Unique Identifiers (OUIs).
Keywords:
Media access control layer, Data link layer, Address
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